Re: Synchronization between a crtc mode_set and page_flip?

On Wednesday 02 April 2014 06:41 PM, Rob Clark wrote:

On Wed, Apr 2, 2014 at 5:52 AM, Archit Taneja archit@ti.com wrote:

...

Hi,

I was trying to figure out how we are supposed to manage synchronization between a mode_set and a page_flip called on a crtc.

Say, if a mode_set is immediately followed by a page_flip. The driver can't process the page_flip straight away since the hardware is still completing the mode_set.

I guess setcrtc is expected to be synchronous(ish).. so a lot of userspace won't expect the first pageflip to fail with -EBUSY.

Okay, thanks. I guess having setcrtc synchronous isn't that bad.

Archit